Processes for preparing coated printing paper

Abstract

Herein provided are processes for preparing coated printing paper having good print quality by spray coating. Specifically, a coated printing paper is prepared by a process for preparing a coated printing paper having one or more coating layers on at least one side of a base paper, comprising the steps of: preparing a spray coating solution containing a pigment and an binder including a starch, wherein (a) the starch is present at 30-100% by weight of the total amount of the binder, and (b) the Brookfield viscosity measured at 30° C., 100 rpm is 300 mPa·s or less; and applying the coating solution by spray coating to form the outermost coating layer.

1 . A process for preparing a coated printing paper having one or more coating layers on one side or both sides of a base paper, comprising the steps of:
 preparing a spray coating solution containing a pigment and a binder including a starch, wherein (a) the starch is present at 30-100% by weight of the total amount of the binder, and (b) the Brookfield viscosity measured at 30° C., 100 rpm is 300 mPa·s or less; and   applying the coating solution by spray coating to form the outermost coating layer.   
     
     
         2 . The process of  claim 1  wherein the content of the binder is 5 parts by weight or more and less than 20 parts by weight per 100 parts by weight of the pigment. 
     
     
         3 . The process of  claim 1  wherein the content of the starch is 50-100% by weight of the total amount of the binder. 
     
     
         4 . The process of  claim 1  wherein the solids content of the spray coating solution is 60% by weight or less. 
     
     
         5 . The process of  claim 1  wherein the coating mass of the outermost coating layer is 6 g/m 2  or more per side. 
     
     
         6 . The process of  claim 1  wherein the pigment includes ground calcium carbonate at 90% by weight or more of the total amount of the pigment. 
     
     
         7 . The process of  claim 1  wherein the coating speed in the spray coating is 1500 m/min or more. 
     
     
         8 . The process of  claim 1  wherein the spray coating is performed by using a nozzle having a diameter of 0.20-0.60 μm under conditions of a pressure of 5 MPa or more at which the coating solution is delivered.